LogBoard/app.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
LogBoard+ - Веб-панель для просмотра логов микросервисов
Автор: Сергей Антропов
Сайт: https://devops.org.ru
"""

import asyncio
import base64
import json
import os
import re
import secrets
from datetime import datetime, timedelta
from typing import Optional, List, Dict, Union
from pathlib import Path

import docker
from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Query, Depends, HTTPException, status, Body, Request, Response
from fastapi.responses import HTMLResponse, JSONResponse, PlainTextResponse, RedirectResponse
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from pydantic import BaseModel
import jwt
from passlib.context import CryptContext

# Настройки приложения
APP_PORT = int(os.getenv("LOGBOARD_PORT", "9001"))
DEFAULT_TAIL = int(os.getenv("LOGBOARD_TAIL", "500"))
DEFAULT_PROJECT = os.getenv("COMPOSE_PROJECT_NAME")
DEFAULT_PROJECTS = os.getenv("LOGBOARD_PROJECTS")
SKIP_UNHEALTHY = os.getenv("LOGBOARD_SKIP_UNHEALTHY", "true").lower() == "true"
CONTAINER_LIST_TIMEOUT = int(os.getenv("LOGBOARD_CONTAINER_LIST_TIMEOUT", "10"))
CONTAINER_INFO_TIMEOUT = int(os.getenv("LOGBOARD_CONTAINER_INFO_TIMEOUT", "3"))
HEALTH_CHECK_TIMEOUT = int(os.getenv("LOGBOARD_HEALTH_CHECK_TIMEOUT", "2"))

# Настройки безопасности
SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-here-change-in-production")
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("SESSION_TIMEOUT", "3600")) // 60  # 1 час по умолчанию

# Настройки пользователей
ADMIN_USERNAME = os.getenv("LOGBOARD_USER", "admin")
ADMIN_PASSWORD = os.getenv("LOGBOARD_PASS", "admin")

# Инициализация FastAPI
app = FastAPI(
    title="LogBoard+",
    description="Веб-панель для просмотра логов микросервисов",
    version="1.0.0"
)

# Инициализация шаблонов
templates = Jinja2Templates(directory="templates")

# Инициализация безопасности
security = HTTPBearer()
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

# Инициализация Docker клиента
docker_client = docker.from_env()

# serve snapshots directory (downloadable files)
SNAP_DIR = os.getenv("LOGBOARD_SNAPSHOT_DIR", "./snapshots")
os.makedirs(SNAP_DIR, exist_ok=True)
app.mount("/snapshots", StaticFiles(directory=SNAP_DIR), name="snapshots")

# Модели данных
class UserLogin(BaseModel):
    username: str
    password: str

class Token(BaseModel):
    access_token: str
    token_type: str

class TokenData(BaseModel):
    username: Optional[str] = None

# Функции для работы с паролями
def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Проверяет пароль"""
    return pwd_context.verify(plain_password, hashed_password)

def get_password_hash(password: str) -> str:
    """Хеширует пароль"""
    return pwd_context.hash(password)

# Функции для работы с JWT токенами
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
    """Создает JWT токен"""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt

def verify_token(token: str) -> Optional[str]:
    """Проверяет JWT токен и возвращает имя пользователя"""
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            return None
        return username
    except jwt.PyJWTError:
        return None

# Функция для проверки аутентификации
async def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)) -> str:
    """Получает текущего пользователя из токена"""
    token = credentials.credentials
    username = verify_token(token)
    if username is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Недействительный токен",
            headers={"WWW-Authenticate": "Bearer"},
        )
    return username

# Функция для проверки пользователя
def authenticate_user(username: str, password: str) -> bool:
    """Аутентифицирует пользователя"""
    if username == ADMIN_USERNAME:
        # Для простоты используем прямое сравнение паролей
        # В продакшене рекомендуется использовать хешированные пароли
        return password == ADMIN_PASSWORD
    return False

# ---------- DOCKER HELPERS ----------
def load_excluded_containers() -> List[str]:
    """
    Загружает список исключенных контейнеров из JSON файла
    Автор: Сергей Антропов
    Сайт: https://devops.org.ru
    """
    try:
        with open("excluded_containers.json", "r", encoding="utf-8") as f:
            data = json.load(f)
            return data.get("excluded_containers", [])
    except FileNotFoundError:
        print("⚠️  Файл excluded_containers.json не найден, используем пустой список")
        return []
    except json.JSONDecodeError as e:
        print(f"❌ Ошибка парсинга excluded_containers.json: {e}")
        return []
    except Exception as e:
        print(f"❌ Ошибка загрузки excluded_containers.json: {e}")
        return []

def save_excluded_containers(containers: List[str]) -> bool:
    """
    Сохраняет список исключенных контейнеров в JSON файл
    Автор: Сергей Антропов
    Сайт: https://devops.org.ru
    """
    try:
        data = {
            "excluded_containers": containers,
            "description": "Список контейнеров, которые генерируют слишком много логов и исключаются из отображения"
        }
        with open("excluded_containers.json", "w", encoding="utf-8") as f:
            json.dump(data, f, indent=2, ensure_ascii=False)
        return True
    except Exception as e:
        print(f"❌ Ошибка сохранения excluded_containers.json: {e}")
        return False

def get_all_projects() -> List[str]:
    """
    Получает список всех проектов Docker Compose с учетом исключенных контейнеров
    Автор: Сергей Антропов
    Сайт: https://devops.org.ru
    """
    projects = set()
    excluded_containers = load_excluded_containers()
    
    try:
        containers = docker_client.containers.list(all=True)
        
        # Словарь для подсчета контейнеров по проектам
        project_containers = {}
        standalone_containers = []
        
        for c in containers:
            try:
                # Пропускаем исключенные контейнеры
                if c.name in excluded_containers:
                    continue
                    
                labels = c.labels or {}
                project = labels.get("com.docker.compose.project")
                
                if project:
                    if project not in project_containers:
                        project_containers[project] = 0
                    project_containers[project] += 1
                else:
                    standalone_containers.append(c.name)
                    
            except Exception:
                continue
        
        # Добавляем проекты, у которых есть хотя бы один неисключенный контейнер
        for project, count in project_containers.items():
            if count > 0:
                projects.add(project)
        
        # Добавляем standalone, если есть неисключенные контейнеры без проекта
        if standalone_containers:
            projects.add("standalone")
            
    except Exception as e:
        print(f"❌ Ошибка получения списка проектов: {e}")
        return []
    
    result = sorted(list(projects))
    print(f"📋 Доступные проекты (с учетом исключенных контейнеров): {result}")
    return result

def list_containers(projects: Optional[List[str]] = None, include_stopped: bool = False) -> List[Dict]:
    """
    Получает список контейнеров с поддержкой множественных проектов
    Автор: Сергей Антропов
    Сайт: https://devops.org.ru
    """
    # Загружаем список исключенных контейнеров из JSON файла
    excluded_containers = load_excluded_containers()
    
    print(f"🚫 Список исключенных контейнеров: {excluded_containers}")
    
    items = []
    excluded_count = 0
    
    try:
        # Получаем список контейнеров с базовой обработкой ошибок
        containers = docker_client.containers.list(all=include_stopped)
        
        for c in containers:
            try:
                # Базовая информация о контейнере (без health check)
                basic_info = {
                    "id": c.id[:12],
                    "name": c.name,
                    "status": c.status,
                    "image": "unknown",
                    "service": c.name,
                    "project": None,
                    "health": None,
                    "ports": [],
                    "url": None,
                }
                
                # Безопасно получаем метки
                try:
                    labels = c.labels or {}
                    basic_info["project"] = labels.get("com.docker.compose.project")
                    basic_info["service"] = labels.get("com.docker.compose.service") or c.name
                except Exception:
                    pass  # Используем значения по умолчанию
                
                # Безопасно получаем информацию об образе
                try:
                    if c.image and c.image.tags:
                        basic_info["image"] = c.image.tags[0]
                    elif c.image:
                        basic_info["image"] = c.image.short_id
                except Exception:
                    pass  # Оставляем "unknown"
                
                # Безопасно получаем информацию о портах
                try:
                    ports = c.ports or {}
                    if ports:
                        basic_info["ports"] = list(ports.keys())
                        
                        # Пытаемся найти HTTP/HTTPS порт для создания URL
                        for port_mapping in ports.values():
                            if port_mapping:
                                for mapping in port_mapping:
                                    if isinstance(mapping, dict) and mapping.get("HostPort"):
                                        host_port = mapping["HostPort"]
                                        # Проверяем, что это HTTP порт (80, 443, 8080, 3000, etc.)
                                        host_port_int = int(host_port)
                                        if (host_port_int in [80, 443] or 
                                            (3000 <= host_port_int <= 4000) or 
                                            (8000 <= host_port_int <= 9000)):
                                            protocol = "https" if host_port == "443" else "http"
                                            basic_info["url"] = f"{protocol}://localhost:{host_port}"
                                            break
                                if basic_info["url"]:
                                    break
                except Exception:
                    pass  # Оставляем пустые значения
                
                # Фильтрация по проектам
                if projects:
                    # Если проект не указан, считаем его standalone
                    container_project = basic_info["project"] or "standalone"
                    if container_project not in projects:
                        continue
                
                # Фильтрация исключенных контейнеров
                if basic_info["name"] in excluded_containers:
                    excluded_count += 1
                    print(f"⚠️  Пропускаем исключенный контейнер: {basic_info['name']}")
                    continue
                
                # Добавляем контейнер в список
                items.append(basic_info)
                
            except Exception as e:
                # Пропускаем контейнеры с критическими ошибками
                print(f"⚠️  Пропускаем проблемный контейнер {c.name if hasattr(c, 'name') else 'unknown'} (ID: {c.id[:12]}): {e}")
                continue
        
    except Exception as e:
        print(f"❌ Ошибка получения списка контейнеров: {e}")
        return []
    
    # Сортируем по проекту, сервису и имени
    items.sort(key=lambda x: (x.get("project") or "", x.get("service") or "", x.get("name") or ""))
    
    # Подсчитываем статистику по проектам
    project_stats = {}
    for item in items:
        project = item.get("project") or "standalone"
        if project not in project_stats:
            project_stats[project] = {"visible": 0, "excluded": 0}
        project_stats[project]["visible"] += 1
    
    # Подсчитываем исключенные контейнеры по проектам
    for c in containers:
        try:
            if c.name in excluded_containers:
                labels = c.labels or {}
                project = labels.get("com.docker.compose.project") or "standalone"
                if project not in project_stats:
                    project_stats[project] = {"visible": 0, "excluded": 0}
                project_stats[project]["excluded"] += 1
        except Exception:
            continue
    
    print(f"📊 Статистика: найдено {len(items)} контейнеров, исключено {excluded_count} контейнеров")
    for project, stats in project_stats.items():
        print(f"   📦 {project}: {stats['visible']} видимых, {stats['excluded']} исключенных")
    
    return items

# ---------- HTML ----------
INDEX_PATH = os.getenv("LOGBOARD_INDEX_HTML", "./templates/index.html")
def load_index_html() -> str:
    """Загружает HTML шаблон главной страницы"""
    with open(INDEX_PATH, "r", encoding="utf-8") as f:
        return f.read()

def load_login_html() -> str:
    """Загружает HTML шаблон страницы входа"""
    login_path = "./templates/login.html"
    with open(login_path, "r", encoding="utf-8") as f:
        return f.read()

# ---------- ROUTES ----------
@app.get("/", response_class=HTMLResponse)
async def index(request: Request):
    """Главная страница приложения"""
    # Проверяем наличие токена в cookie
    access_token = request.cookies.get("access_token")
    if not access_token:
        return RedirectResponse(url="/login")
    
    # Проверяем валидность токена
    username = verify_token(access_token)
    if not username:
        return RedirectResponse(url="/login")
    
    return templates.TemplateResponse("index.html", {"request": request})

@app.get("/login", response_class=HTMLResponse)
async def login_page(request: Request):
    """Страница входа"""
    return templates.TemplateResponse("login.html", {"request": request})

@app.post("/api/auth/login", response_model=Token)
async def login(user_data: UserLogin, response: Response):
    """API для входа в систему"""
    if authenticate_user(user_data.username, user_data.password):
        access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
        access_token = create_access_token(
            data={"sub": user_data.username}, expires_delta=access_token_expires
        )
        
        # Устанавливаем cookie с токеном
        response.set_cookie(
            key="access_token",
            value=access_token,
            httponly=True,
            secure=False,  # Установите True для HTTPS
            samesite="lax",
            max_age=ACCESS_TOKEN_EXPIRE_MINUTES * 60
        )
        
        return {"access_token": access_token, "token_type": "bearer"}
    else:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Неверное имя пользователя или пароль",
            headers={"WWW-Authenticate": "Bearer"},
        )

@app.post("/api/auth/logout")
async def logout(response: Response):
    """API для выхода из системы"""
    response.delete_cookie(key="access_token")
    return {"message": "Успешный выход из системы"}

@app.get("/api/auth/me")
async def get_current_user_info(current_user: str = Depends(get_current_user)):
    """Получить информацию о текущем пользователе"""
    return {"username": current_user}

@app.get("/healthz", response_class=PlainTextResponse)
def healthz():
    """Health check endpoint"""
    return "ok"

@app.get("/api/logs/stats/{container_id}")
def api_logs_stats(container_id: str, current_user: str = Depends(get_current_user)):
    """Получить статистику логов контейнера"""
    try:
        # Ищем контейнер
        container = None
        for c in docker_client.containers.list(all=True):
            if c.id.startswith(container_id):
                container = c
                break
        
        if container is None:
            return JSONResponse({"error": "Container not found"}, status_code=404)
        
        # Получаем логи
        logs = container.logs(tail=1000).decode(errors="ignore")
        
        # Подсчитываем статистику
        stats = {"debug": 0, "info": 0, "warn": 0, "error": 0}
        
        for line in logs.split('\n'):
            if not line.strip():
                continue
            
            line_lower = line.lower()
            if 'level=debug' in line_lower or 'debug' in line_lower:
                stats["debug"] += 1
            elif 'level=info' in line_lower or 'info' in line_lower:
                stats["info"] += 1
            elif 'level=warning' in line_lower or 'level=warn' in line_lower or 'warning' in line_lower or 'warn' in line_lower:
                stats["warn"] += 1
            elif 'level=error' in line_lower or 'error' in line_lower:
                stats["error"] += 1
        
        return JSONResponse(
            content=stats,
            headers={
                "Cache-Control": "no-cache, no-store, must-revalidate",
                "Pragma": "no-cache",
                "Expires": "0"
            }
        )
        
    except Exception as e:
        print(f"Error getting log stats for {container_id}: {e}")
        return JSONResponse({"error": str(e)}, status_code=500)

@app.get("/api/excluded-containers")
def api_get_excluded_containers(current_user: str = Depends(get_current_user)):
    """Получить список исключенных контейнеров"""
    return JSONResponse(
        content={"excluded_containers": load_excluded_containers()},
        headers={
            "Cache-Control": "no-cache, no-store, must-revalidate",
            "Pragma": "no-cache",
            "Expires": "0"
        }
    )

@app.post("/api/excluded-containers")
def api_update_excluded_containers(
    containers: List[str] = Body(...),
    current_user: str = Depends(get_current_user)
):
    """Обновить список исключенных контейнеров"""
    success = save_excluded_containers(containers)
    if success:
        return JSONResponse(
            content={"status": "success", "message": "Список исключенных контейнеров обновлен"},
            headers={
                "Cache-Control": "no-cache, no-store, must-revalidate",
                "Pragma": "no-cache",
                "Expires": "0"
            }
        )
    else:
        raise HTTPException(status_code=500, detail="Ошибка сохранения списка")

@app.get("/api/projects")
def api_projects(current_user: str = Depends(get_current_user)):
    """Получить список всех проектов Docker Compose"""
    return JSONResponse(
        content=get_all_projects(),
        headers={
            "Cache-Control": "no-cache, no-store, must-revalidate",
            "Pragma": "no-cache",
            "Expires": "0"
        }
    )

@app.get("/api/services")
def api_services(
    projects: Optional[str] = Query(None), 
    include_stopped: bool = Query(False),
    current_user: str = Depends(get_current_user)
):
    """Получить список контейнеров с поддержкой множественных проектов"""
    project_list = None
    if projects:
        project_list = [p.strip() for p in projects.split(",") if p.strip()]
    elif DEFAULT_PROJECTS:
        project_list = [p.strip() for p in DEFAULT_PROJECTS.split(",") if p.strip()]
    elif DEFAULT_PROJECT:
        project_list = [DEFAULT_PROJECT]
    
    return JSONResponse(
        content=list_containers(projects=project_list, include_stopped=include_stopped),
        headers={
            "Cache-Control": "no-cache, no-store, must-revalidate",
            "Pragma": "no-cache",
            "Expires": "0"
        }
    )

@app.post("/api/snapshot")
def api_snapshot(
    current_user: str = Depends(get_current_user),
    container_id: str = Body(..., embed=True),
    service: str = Body("", embed=True),
    content: str = Body("", embed=True),
):
    """Сохранить снимок логов"""
    # Save posted content as a snapshot file
    safe_service = re.sub(r"[^a-zA-Z0-9_.-]+", "_", service or container_id[:12])
    ts = os.getenv("TZ_TS") or ""
    from datetime import datetime
    stamp = datetime.now().strftime("%Y%m%d-%H%M%S")
    fname = f"{safe_service}-{stamp}.log"
    fpath = os.path.join(SNAP_DIR, fname)
    with open(fpath, "w", encoding="utf-8") as f:
        f.write(content)
    url = f"/snapshots/{fname}"
    return {"file": fname, "url": url}

# WebSocket: verify token (?token=base64(user:pass))
@app.websocket("/ws/logs/{container_id}")
async def ws_logs(ws: WebSocket, container_id: str, tail: int = DEFAULT_TAIL, token: Optional[str] = None,
                  service: Optional[str] = None, project: Optional[str] = None):
    """WebSocket для получения логов контейнера"""
    
    # Принимаем соединение
    await ws.accept()
    
    # Проверяем токен
    if not token:
        await ws.send_text("ERROR: token required")
        await ws.close()
        return
    
    username = verify_token(token)
    if not username:
        await ws.send_text("ERROR: invalid token")
        await ws.close()
        return

    try:
        # Простой поиск контейнера по ID
        container = None
        try:
            for c in docker_client.containers.list(all=True):
                if c.id.startswith(container_id):
                    container = c
                    break
        except Exception as e:
            await ws.send_text(f"ERROR: cannot list containers - {e}")
            return

        if container is None:
            await ws.send_text("ERROR: container not found")
            return

        # Отправляем начальное сообщение
        await ws.send_text(f"Connected to container: {container.name}")

        # Получаем логи (только последние строки, без follow)
        try:
            print(f"Getting logs for container {container.name} (ID: {container.id[:12]})")
            logs = container.logs(tail=tail).decode(errors="ignore")
            if logs:
                await ws.send_text(logs)
            else:
                await ws.send_text("No logs available")
        except Exception as e:
            print(f"Error getting logs for {container.name}: {e}")
            await ws.send_text(f"ERROR getting logs: {e}")

        # Простое WebSocket соединение - только отправляем логи один раз
        print(f"WebSocket connection established for {container.name}")

    except WebSocketDisconnect:
        print(f"WebSocket client disconnected for container {container.name}")
    except Exception as e:
        print(f"WebSocket error for {container.name}: {e}")
        try:
            await ws.send_text(f"ERROR: {e}")
        except:
            pass
    finally:
        try:
            print(f"Closing WebSocket connection for container {container.name}")
            await ws.close()
        except:
            pass

# WebSocket: fan-in by compose service (aggregate all replicas), prefixing with short container id
@app.websocket("/ws/fan/{service_name}")
async def ws_fan(ws: WebSocket, service_name: str, tail: int = DEFAULT_TAIL, token: Optional[str] = None,
                 project: Optional[str] = None):
    await ws.accept()
    
    # Проверяем токен
    if not token:
        await ws.send_text("ERROR: token required")
        await ws.close()
        return
    
    username = verify_token(token)
    if not username:
        await ws.send_text("ERROR: invalid token")
        await ws.close()
        return

    # Track active streaming tasks by container id
    active = {}

    def list_by_service(service_name: str, project_name: Optional[str] = None):
        found = []
        for c in docker_client.containers.list(all=True):
            lbl = c.labels or {}
            if lbl.get("com.docker.compose.service") == service_name and (project_name is None or lbl.get("com.docker.compose.project")==project_name):
                found.append(c)
        # sort by Created asc so first lines look ordered-ish
        try:
            found.sort(key=lambda x: x.attrs.get("Created",""))
        except Exception:
            pass
        return found

    async def stream_container(cont):
        short = cont.id[:8]
        first_tail = tail
        while True:
            try:
                use_tail = first_tail
                first_tail = 0
                stream = cont.logs(stream=True, follow=True, tail=(use_tail if use_tail>0 else "all"))
                for chunk in stream:
                    if chunk is None:
                        break
                    try:
                        await ws.send_text(f"[{short}] " + chunk.decode(errors="ignore"))
                    except RuntimeError:
                        stream.close(); return
                stream.close()
                # container stopped -> wait and try to find same id again; if gone, exit loop and outer watcher will reassign
                await asyncio.sleep(1.0)
            except WebSocketDisconnect:
                return
            except Exception:
                await asyncio.sleep(1.0)
                continue

    async def watcher():
        # Periodically reconcile set of containers
        try:
            while True:
                desired = {c.id: c for c in list_by_service(service_name, project)}
                # start missing
                for cid, cont in desired.items():
                    if cid not in active:
                        task = asyncio.create_task(stream_container(cont))
                        active[cid] = task
                # cancel removed
                for cid in list(active.keys()):
                    if cid not in desired:
                        task = active.pop(cid)
                        task.cancel()
                await asyncio.sleep(2.0)
        except asyncio.CancelledError:
            pass

    watch_task = asyncio.create_task(watcher())
    try:
        # Keep ws open until disconnected; the tasks stream data
        while True:
            await asyncio.sleep(1.0)
    except WebSocketDisconnect:
        pass
    finally:
        watch_task.cancel()
        for t in active.values():
            t.cancel()
        try:
            await ws.close()
        except Exception:
            pass

# WebSocket: fan-in for multiple compose services (comma-separated), optional project filter.
@app.websocket("/ws/fan_group")
async def ws_fan_group(ws: WebSocket, services: str, tail: int = DEFAULT_TAIL, token: Optional[str] = None,
                       project: Optional[str] = None):
    await ws.accept()
    
    # Проверяем токен
    if not token:
        await ws.send_text("ERROR: token required")
        await ws.close()
        return
    
    username = verify_token(token)
    if not username:
        await ws.send_text("ERROR: invalid token")
        await ws.close()
        return

    svc_set = {s.strip() for s in services.split(",") if s.strip()}
    if not svc_set:
        await ws.send_text("ERROR: no services provided")
        await ws.close(); return

    active = {}

    def list_by_services(names, project_name: Optional[str] = None):
        res = []
        for c in docker_client.containers.list(all=True):
            lbl = c.labels or {}
            if lbl.get("com.docker.compose.service") in names and (project_name is None or lbl.get("com.docker.compose.project")==project_name):
                res.append(c)
        try:
            res.sort(key=lambda x: x.attrs.get("Created",""))
        except Exception:
            pass
        return res

    async def stream_container(cont):
        short = cont.id[:8]
        svc = (cont.labels or {}).get("com.docker.compose.service","")
        first_tail = tail
        while True:
            try:
                use_tail = first_tail
                first_tail = 0
                stream = cont.logs(stream=True, follow=True, tail=(use_tail if use_tail>0 else "all"))
                for chunk in stream:
                    if chunk is None:
                        break
                    line = chunk.decode(errors="ignore")
                    try:
                        await ws.send_text(f"[{short} {svc}] " + line)
                    except RuntimeError:
                        stream.close(); return
                stream.close()
                await asyncio.sleep(1.0)
            except WebSocketDisconnect:
                return
            except Exception:
                await asyncio.sleep(1.0)
                continue

    async def watcher():
        try:
            while True:
                desired = {c.id: c for c in list_by_services(svc_set, project)}
                for cid, cont in desired.items():
                    if cid not in active:
                        task = asyncio.create_task(stream_container(cont))
                        active[cid] = task
                for cid in list(active.keys()):
                    if cid not in desired:
                        task = active.pop(cid)
                        task.cancel()
                await asyncio.sleep(2.0)
        except asyncio.CancelledError:
            pass

    watch_task = asyncio.create_task(watcher())
    try:
        while True:
            await asyncio.sleep(1.0)
    except WebSocketDisconnect:
        pass
    finally:
        watch_task.cancel()
        for t in active.values():
            t.cancel()
        try:
            await ws.close()
        except Exception:
            pass

if __name__ == "__main__":
    import uvicorn
    print(f"LogBoard+ http://0.0.0.0:{APP_PORT}")
    uvicorn.run(app, host="0.0.0.0", port=APP_PORT)